Diffusion of Positive Muons in Aluminum and Aluminum-Based Alloys
Results from muon spin rotation (μSR) measurements on doped aluminum samples are reported. The doping elements were Mn at various concentrations, and Li, Mg, Ag at concentrations of about loo ppm. The μSR linewidth exhibits typical trapping maxima above 1 K, whereas below 1 K the linewidth increases monotonically with decreasing temperature. The analysis of the trapping peak above 1 K reveals a capture rate proportional to temperature. The increase of the linewidth below 1 K is attributed to capture controlled by coherent diffusion. The coefficient of coherent diffusion is found proportional to T−0.6. The temperature dependence of the diffusion coefficient in both regions is compared with current theories of diffusion of light interstitials in metals.
KeywordsCapture Rate Doping Element Trapping Rate Positive Muon Muon Spin Rotation
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- K.W. Kehr, D. Richter, J.M. Welter, O. Hartmann, E. Karlsson, L.O. Norlin, T.O. Niinikoski, A. Yaouanc, subm. to Phys.Rev.B.Google Scholar